/*
 * CVS identifier:
 *
 * $Id: WaveletTransform.java,v 1.18 2001/10/24 12:02:35 grosbois Exp $
 *
 * Class:                   WaveletTransform
 *
 * Description:             Interface that defines how a forward or
 *                          inverse wavelet transform should present
 *                          itself.
 *
 *
 *
 * COPYRIGHT:
 * 
 * This software module was originally developed by Raphaël Grosbois and
 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
 * Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
 * Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
 * Centre France S.A) in the course of development of the JPEG2000
 * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
 * software module is an implementation of a part of the JPEG 2000
 * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
 * Systems AB and Canon Research Centre France S.A (collectively JJ2000
 * Partners) agree not to assert against ISO/IEC and users of the JPEG
 * 2000 Standard (Users) any of their rights under the copyright, not
 * including other intellectual property rights, for this software module
 * with respect to the usage by ISO/IEC and Users of this software module
 * or modifications thereof for use in hardware or software products
 * claiming conformance to the JPEG 2000 Standard. Those intending to use
 * this software module in hardware or software products are advised that
 * their use may infringe existing patents. The original developers of
 * this software module, JJ2000 Partners and ISO/IEC assume no liability
 * for use of this software module or modifications thereof. No license
 * or right to this software module is granted for non JPEG 2000 Standard
 * conforming products. JJ2000 Partners have full right to use this
 * software module for his/her own purpose, assign or donate this
 * software module to any third party and to inhibit third parties from
 * using this software module for non JPEG 2000 Standard conforming
 * products. This copyright notice must be included in all copies or
 * derivative works of this software module.
 * 
 * Copyright (c) 1999/2000 JJ2000 Partners.
 * */
package jj2000.j2k.wavelet;

import jj2000.j2k.image.*;

/**
 * This interface defines how a forward or inverse wavelet transform should
 * present itself. As specified in the ImgData interface, from which this
 * class inherits, all operations are confined to the current tile, and all
 * coordinates are relative to it.
 *
 * <p>The definition of the methods in this interface allows for different
 * types of implementation, reversibility and levels of decompositions for
 * each component and each tile. An implementation of this interface does not
 * need to support all this flexibility (e.g., it may provide the same
 * implementation type and decomposition levels for all tiles and
 * components).</p>
 * */
public interface WaveletTransform extends ImgData {

    /**
     * ID for line based implementations of wavelet transforms.
     * */
    public final static int WT_IMPL_LINE = 0;

    /**
     * ID for full-page based implementations of wavelet transforms. Full-page
     * based implementations should be avoided since they require large
     * amounts of memory.
     * */
    public final static int WT_IMPL_FULL = 2;


    /**
     * Returns the reversibility of the wavelet transform for the specified
     * component and tile. A wavelet transform is reversible when it is
     * suitable for lossless and lossy-to-lossless compression.
     *
     * @param t The index of the tile.
     *
     * @param c The index of the component.
     *
     * @return true is the wavelet transform is reversible, false if not.
     * */
    public boolean isReversible(int t,int c);

    /**
     * Returns the implementation type of this wavelet transform (WT_IMPL_LINE
     * or WT_IMPL_FRAME) for the specified component, in the current tile.
     *
     * @param c The index of the component.
     *
     * @return WT_IMPL_LINE or WT_IMPL_FULL for line, block or full-page based
     * transforms.
     * */
    public int getImplementationType(int c);
}
